Power of Attorney for Brian N. Cherry

This filing documents a Power of Attorney granted by Brian N. Cherry, a director at Atara Biotherapeutics, Inc., to Yanina Grant-Huerta and John Chao. The attorneys-in-fact are authorized to execute and complete necessary SEC filings, including Forms 3, 4, and 5, and Forms 144, related to the ownership, acquisition, or disposition of the company's securities. This authorization is in accordance with Section 16 of the Securities Exchange Act of 1934 and Rule 144 of the Securities Act of 1933. The Power of Attorney remains effective until Mr. Cherry is no longer required to file these forms or until it is revoked in writing. The filing also indicates that Mr. Cherry directly owns 38,320 shares of common stock following a transaction.